/*
 * Copyright 2010, Thorbjrn Lindeijer <thorbjorn@lindeijer.nl>
 *
 * This file is part of libtiled-java.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package tiled.view;

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;

import tiled.core.Map;
import tiled.core.Tile;
import tiled.core.TileLayer;

/**
 * The orthogonal map renderer. This is the most basic map renderer, dealing with maps that use rectangular tiles.
 */
public class OrthogonalRenderer implements MapRenderer {
	private final Map	map;

	public OrthogonalRenderer(Map map) {
		this.map = map;
	}

	@Override
	public Dimension getMapSize() {
		return new Dimension(this.map.getWidth() * this.map.getTileWidth(), this.map.getHeight() * this.map.getTileHeight());
	}

	@Override
	public void paintTileLayer(Graphics2D g, TileLayer layer) {
		final Rectangle clip = g.getClipBounds();
		final int tileWidth = this.map.getTileWidth();
		final int tileHeight = this.map.getTileHeight();
		final Rectangle bounds = layer.getBounds();

		g.translate(bounds.x * tileWidth, bounds.y * tileHeight);
		clip.translate(-bounds.x * tileWidth, -bounds.y * tileHeight);

		clip.height += this.map.getTileHeightMax();

		final int startX = Math.max(0, clip.x / tileWidth);
		final int startY = Math.max(0, clip.y / tileHeight);
		final int endX = Math.min(layer.getWidth(), (int) Math.ceil(clip.getMaxX() / tileWidth));
		final int endY = Math.min(layer.getHeight(), (int) Math.ceil(clip.getMaxY() / tileHeight));

		for (int x = startX; x < endX; ++x) {
			for (int y = startY; y < endY; ++y) {
				final Tile tile = layer.getTileAt(x, y);
				if (tile == null) {
					continue;
				}
				final Image image = tile.getImage();
				if (image == null) {
					continue;
				}

				g.drawImage(image, x * tileWidth, ((y + 1) * tileHeight) - image.getHeight(null), null);
			}
		}

		g.translate(-bounds.x * tileWidth, -bounds.y * tileHeight);
	}
}
